* {
    margin: 0;
    padding: 0;
}

.input-box {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    width: 70%;
    height: 200px;
    border-radius: 20px;
    background: white;
    z-index: 9999;
    border: 1px solid grey
}

.input-box>textarea {
    box-shadow: none;
    border: none;
    border-radius: 20px;
    margin-left: 10px;
    width: 90%;
    height: 80%
}

.input-box>.button {
    position: absolute;
    bottom: 5px;
    right: 10px;
}